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4-stator-pole step motor with passive inter-poles

a step motor and passive technology, applied in the direction of electrical equipment, dynamo-electric machines, etc., can solve the problems of lack of pole shoes, lack of conductive windings of dummy interpoles, etc., to improve motor efficiency, minimize flux leakage, and develop maximum torque

Active Publication Date: 2022-07-21
LIN ENG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent introduces a two-phase bipolar step motor that has significantly improved performance by using four dummy inter-poles in addition to the four primary stator poles. The motor has faster magnetic flux paths, higher efficiency, and reduced flux leakage. This design maximizes torque and uses the magnetic flux on the rotor. The motor has been tested and shown to perform better than conventionally designed motors in both an 18° and a -30° stepper configuration.

Problems solved by technology

The dummy inter-poles lack any conductive windings and typically lack pole shoes.

Method used

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  • 4-stator-pole step motor with passive inter-poles
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  • 4-stator-pole step motor with passive inter-poles

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Embodiment Construction

[0017]With reference to FIGS. 4-6, an 18° hybrid-PM mix step motor, representative of the invention, is seen in respective A-phase ON, AB-phase ON and B-phase ON conditions, which are three of the eight full-step and half-step drive phases of the motor. The other drive phases are comparable but with one or both drive current directions reversed, as is well known in the art. The one phase ON conditions (A+, B+, A−, and B−) are the full step positions separated by 18° rotations of the rotor. The various two phase ON conditions (A+B+, A−B+, A−B−, and A+B−) are offset by a half-step rotation of 9° from the full step positions. A micro-stepping mode of operation is also possible, where the A and B stator pole windings receive various amounts of drive current less than the full amplitude, so that the rotor is in positions between the full-step and half-step positions.

[0018]All the hybrid-PM mix steppers (both the one illustrated in FIGS. 4-6 and another shown in FIGS. 10-12), may have the...

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Abstract

A two-phase bipolar step motor, comprises a rotor having a plurality of pairs of rotor poles of alternating magnetic polarity, and a stator having four primary energizable stator poles with conductive windings around those primary stator poles and four passive inter-poles located uniformly between every adjacent pair of primary stator poles, the passive inter-poles lacking any conductive windings. Both 18° steppers with five pairs of rotor poles and 30° steppers with three pairs of rotor poles are provided. Also provided are both PM hybrid mix steppers with 2D magnetic flux paths and hybrid steppers with 3D magnetic flux paths having an axial component. In each case, the overall lengths of the flux paths are substantially reduced from conventional designs resulting in improved motor efficiency.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority under 35 U.S.C. 119(e) from U.S. Provisional Application 63 / 138,150, filed Jan. 15, 2021.TECHNICAL FIELD[0002]The invention relates generally to motors wherein a rotor driven by a stator rotates step-by-step between successive detent positions, i.e., stepping motors, and more specifically to stepping motors with a four-stator-pole design with large fundamental step angles, such as 18° and 30° steppers, with particular emphasis on increasing motor efficiency.BACKGROUND ART[0003]A wide range of motor applications, including the orienting of communication devices, surveillance cameras, and stage lighting, need only relatively low directional resolution, but require adequate dynamic and holding torque from the motors to be able to reorient such equipment at a useful speed. 18° permanent magnet (PM) type stepping motors are frequently used for this purpose because of their speed and torque performance. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02K37/14
CPCH02K37/14H02K37/04
Inventor LIN, TED T.
Owner LIN ENG INC
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